Answer:
Step-by-step explanation:
12. 6(5n-3)=36n
-divide each side by six: 5n-3=6n
-subtract 5n from 6n: n= -3
14. 5b+8/3=3b
-multiply each side by 3: 5b+8=9b
-subtract 5b from 9b: 8=4b
-divide each side by 4: b=2
16. 3r+4-8r=4r-12
-subtract 3r-8r= 5r: 5r+4=4r-12
-Subtract 4r from 5r, then subtract 4 from 12
r = -16
